Friday, September18, 2020
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L-36.com

Marine Weather and Tides
Larkspur, CA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:53AMSunset 7:14PM Friday September 18, 2020 9:35 AM PDT (16:35 UTC) Moonrise 7:15AMMoonset 7:26PM Illumination 2% Phase: Waxing Crescent; Moon at 1 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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PZZ530 San Pablo Bay, Suisun Bay, The West Delta And The San Francisco Bay North Of The Bay Bridge- 830 Am Pdt Fri Sep 18 2020
Today..SW winds up to 10 kt, increasing to 10 to 20 kt with gusts up to 25 kt this afternoon.
Tonight..W winds 5 to 15 kt with gusts up to 25 kt.
Sat..SW winds 5 to 15 kt.
Sat night..SW winds 5 to 10 kt.
Sun..SW winds 5 to 15 kt.
Sun night..SW winds 5 to 15 kt.
Mon..SW winds 10 to 20 kt with gusts up to 25 kt.
Tue..W winds 10 to 20 kt with gusts up to 25 kt.
PZZ500 830 Am Pdt Fri Sep 18 2020
Synopsis for the central california coast and bays including the Monterey bay..Greater farallones...and cordell bank national marine sanctuaries... Light northwest winds with locally stronger northwest winds south of pigeon point, into the northern Monterey bay, and south of point sur along the big sur coast. Winds are forecast to increase Saturday. Mixed seas prevail with a shorter period northwest swell and a moderate period south to southwest swell.


7 Day Forecast for Marine Location Near Larkspur, CA
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location: 37.94, -122.53     debug


Area Discussion for - San Francisco/Monterey Bay Area, CA
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FXUS66 KMTR 181203 AFDMTR

Area Forecast Discussion National Weather Service San Francisco Bay Area 503 AM PDT Fri Sep 18 2020

SYNOPSIS. A weak front will clip the North Bay this morning while mid-level moisture streams across Monterey and San Benito Counties. A few sprinkles along the coast are possible through the early morning hours. Otherwise, a cool down today and tomorrow followed by near normal temperatures, especially in the interior, this weekend. Another slight cooldown expected primarily across the interior during the early part of next week before temps rebound again.

DISCUSSION. As of 3:05 AM PDT Thursday . WNW winds are being measured at higher-terrain stations in the North and East Bays and the SF Peninsula as the cold front associated with the 564dm 500hPa trough off the PAC NW coast continues to slowly inch its way towards the Oregon shoreline. Moisture associated with the trough has evolved into convection and rain over Oregon and Washington State while moisture returns further down in extreme NorCal have been minimal, at best. Back here in the CWA, the moisture that has been moving over the Central Coast for most of the day is associated with the remnants of tropical storm Karina. While there were some minor concerns for overnight high-based convection with dry lightning (which was a fair concern if we recall the aftermath of the remnants from Genevieve last month), the bulk of the moisture looks to be moved out of the Central Coast by the cold frontal passage by mid-morning. GOES-17 has picked up the lightning strikes over the PAC NW tonight but for us, only seeing a continuation of the moisture transport from Karina in the form of a long stretch of alto-cu and the possibility for some patchy drizzle along our coastal locations through the morning. Nevertheless, will continue to monitor the moisture plume through the rest of the morning.

HRRR-07Z 850hPA winds and temperature capture the wind shift and the frontal passage already being observed in higher-terrain locations. As the surface front clips the entire CWA this morning, some uncertainty exists over how quickly coastal clearing occurs. Fort Ord Profiler has observed an uptick in the marine layer depth within the last couple of hours. That being said, the early-to-mid morning marine layer inversion will likely not be very strong given the cold frontal passage. Could see coastal clearing by mid-to-late morning as a result in a north- south fashion. The possibility for the coastal clearing to occur closer to noon is still on the table, however, given surface low- level mixing may be delayed due to weak winds within the lower atmosphere.

Looking into Friday afternoon and the rest of this upcoming weekend, cold frontal passage will substantially cool down the interior, which for the last couple of days has benefited from greater diurnal heating as smoke has cleared out over much of the CWA since this past Wednesday. Cool down will run through Saturday as the axis of the upper-level trough comes ashore and moves east towards the Canadian Prairies/Montana. As it exits the West Coast, a subtle ridge axis will settle around 125W and allow for a gradual rebound in interior max temps on Sunday. Some locations, like Livermore and San Jose, may observe max temps that are as much as 8 degrees F warmer than Friday.

In terms of air quality for this upcoming weekend, conditions may potentially deteriorate in the North Bay as HRRRx vertically integrated smoke product picks up on the smoke canopy from the August Complex being advected to Napa and Sonoma Counties following the cold frontal passage and the subsequent introduction of more northerly flow.

Model guidance brings a shortwave trough into the PAC NW next Monday around the same location where our upper-level trough is currently located. Interior locations in our CWA will subsequently experience a gradual cooldown through next Wednesday, removing diurnal gains from the weekend. Nevertheless, following this shortwave, high ensemble member confidence in upper-level ridging to return to the West Coast. Not expecting significant building but should see temps return to seasonal average through the second half of next week.

The last couple of GFS and CMC ensemble runs (including the latest 00Z 9/18 runs) have hinted at the possibility of a possible offshore wind event through the end of next week, with the signature being the most pronounced on the GFS members. Nevertheless, these runs are well over 200 hours out for respective ensembles and have little certainty at this time. For now, this is far enough out that it shouldn't raise of too many eyebrows, but should keep an eye on it in the coming days.

AVIATION. As of 05:05 AM PDT Friday . for 12Z TAFS. Dirty setup making for atypical day with approaching trough from the northwest and remnant tropical moisture from Karina streaming in from the southwest. Expect fairly low IFR to MVFR cigs through this morning as frontal boundary pushes through with high clouds streaming in overhead throughout the day. Generally a boundary like this would mix out the marine layer the following night but thinking the cool air advection aloft will be too weak to do so, thus expecting a return of marine IFR-MVFR layer cigs for tonight. Winds will be stronger than yesterday with locally breezy 12-18kt with local gusts to the 20-25kt range today, though much weaker winds will likely prevail away from the usual windy spots. Some lingering smoke again today.

Vicinity of KSFO . MVFR cigs thru 18Z, then lingering SCT-FEW at 1500-2000 ft midday with passing high clouds. West winds will increase by late morning and strengthen further into the afternoon to around 15k gust 20kt. Borderline IFR-MVFR cigs tonight by 5-8Z SAT.

SFO Bridge Approach . Similar to SFO, but with smoke and haze aloft, slant range visibility may be reduced on approach.

Monterey Bay Terminals . High clouds from Karina over the region obscuring view of low level however marine layer appears mixed out with only lingering FEW-SCT at 1000 feet or so. Redevelopment of some low clouds are possible as frontal boundary passes so left TEMPO borderline IFR-MVFR through mid morning. Locally breezy this afternoon. Marine layer returns tonight.

MARINE. as of 04:53 AM PDT Friday . Predominately light northwest winds with locally stronger northwest winds south of Pigeon Point, into the northern Monterey Bay, and south of Point Sur along the Big Sur coast. Winds are forecast to increase Saturday. Seas remain mixed with a shorter period northwest swell and a moderate period south to southwest swell.

MTR WATCHES/WARNINGS/ADVISORIES. Tday. SCA . Mry Bay from 3 PM SCA . Pigeon Pt to Pt Pinos 0-10 nm from 3 PM SCA . Pt Pinos to Pt Piedras Blancas 0-10 nm



PUBLIC FORECAST: Diaz/AS AVIATION: DRP MARINE: DRP

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Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
TIBC1 - Tiburon Pier, San Francisco Bay, CA 6 mi42 min S 5.1 62°F 1016 hPa (+0.0)
RCMC1 - 9414863 - Richmond, CA 6 mi53 min S 4.1 G 7 63°F 64°F1016 hPa
PPXC1 - 9414847 - Richmond (Point Potrero), CA 9 mi47 min SW 7 G 8 63°F 1016.5 hPa
FTPC1 - 9414290 - San Francisco, CA 10 mi47 min 64°F
PXOC1 - 9414311 - San Francisco (Pier 1), CA 12 mi47 min N 2.9 G 5.1 63°F 1015.2 hPa
46237 - San Francisco Bar, CA (142) 12 mi65 min 60°F3 ft
PXSC1 12 mi47 min 64°F
OKXC1 - 9414776 - Oakland (Berth 34), CA 14 mi47 min SW 2.9 G 5.1 64°F 1016.2 hPa
OBXC1 14 mi47 min 64°F 64°F
OMHC1 - 9414769 - Oakland Middle Harbor Met, CA 14 mi47 min SW 4.1 G 5.1
DPXC1 - 9415141 - Davis Point, San Pablo Bay, CA 16 mi47 min WSW 5.1 G 7 64°F 1015.6 hPa
AAMC1 - 9414750 - Alameda, CA 17 mi47 min 67°F
LNDC1 17 mi47 min S 2.9 G 4.1 65°F 1016.1 hPa
46026 - SAN FRANCISCO - 18NM West of San Francisco, CA 21 mi35 min SW 3.9 G 5.8 61°F1016.7 hPa (+0.9)
MZXC1 - 9415102 - Martinez-Amorco CA 22 mi47 min W 7 G 8.9 66°F 68°F1015.8 hPa
UPBC1 23 mi47 min W 8 G 11
PCOC1 - 9415144 - Port Chicago, CA 27 mi47 min SW 6 G 8 65°F 68°F1015.4 hPa
SFXC1 - San Francisco Bay Reserve, CA 32 mi110 min W 5.1
RTYC1 - 9414523 - Redwood City, CA 34 mi47 min Calm G 1 65°F 73°F1016.5 hPa
PSBC1 - 9415115 - Pittsburg (Suisun Bay), CA 35 mi47 min WNW 6 G 11 68°F 1015.3 hPa
46012 - HALF MOON BAY - 24NM South Southwest of San Francisco, CA 44 mi35 min NNW 3.9 G 5.8 60°F 1016.9 hPa (+0.9)60°F
46013 - Bodega Bay - 48NM North Northwest of San Francisco, CA 46 mi35 min S 3.9 G 3.9 58°F 57°F1016 hPa (+0.9)
46214 - Point Reyes, CA (029) 49 mi39 min 61°F3 ft

Wind History for Richmond, CA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Novato / Gnoss Field, CA14 mi40 minNNE 310.00 miFair64°F62°F94%1015.9 hPa
Petaluma Municipal Airport, CA22 mi40 minVar 310.00 miOvercast63°F59°F88%1016.3 hPa
Napa, Napa County Airport, CA23 mi41 minWSW 710.00 miSmoke65°F60°F84%1014.8 hPa
Oakland, Metro Oakland International Airport, CA23 mi42 minWNW 310.00 miPartly Cloudy68°F59°F73%1016.2 hPa
San Francisco, San Francisco International Airport, CA24 mi39 minWNW 510.00 miA Few Clouds67°F57°F73%1015.8 hPa

Link to 5 minute data for KDVO

Wind History from DVO (wind in knots)
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Last 24hrCalmCalm4SE5W8
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W11--NW7--CalmCalmCalmCalmCalmCalmCalmN4
1 day agoNE6N95NW96W8
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2 days ago34N45NE8
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Tide / Current Tables for Corte Madera Creek, San Francisco Bay, California
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Corte Madera Creek
Click for Map
Fri -- 01:03 AM PDT     6.30 feet High Tide
Fri -- 06:54 AM PDT     Sunrise
Fri -- 07:20 AM PDT     0.08 feet Low Tide
Fri -- 08:15 AM PDT     Moonrise
Fri -- 01:47 PM PDT     6.04 feet High Tide
Fri -- 07:12 PM PDT     Sunset
Fri -- 07:44 PM PDT     0.55 feet Low Tide
Fri -- 08:25 PM PDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.96.3653.520.70.10.212.33.64.95.865.54.42.91.60.70.61.12.23.5

Tide / Current Tables for Red Rock .1 E, San Francisco Bay, California Current
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Red Rock .1 E
Click for Map
Fri -- 02:56 AM PDT     -0.00 knots Slack
Fri -- 05:39 AM PDT     -1.96 knots Max Ebb
Fri -- 06:54 AM PDT     Sunrise
Fri -- 08:15 AM PDT     Moonrise
Fri -- 08:52 AM PDT     0.00 knots Slack
Fri -- 12:01 PM PDT     1.67 knots Max Flood
Fri -- 03:27 PM PDT     -0.00 knots Slack
Fri -- 06:03 PM PDT     -1.84 knots Max Ebb
Fri -- 07:11 PM PDT     Sunset
Fri -- 08:25 PM PDT     Moonset
Fri -- 09:11 PM PDT     0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.30.7-0.1-1.1-1.8-1.9-1.5-0.80.10.91.51.71.51.10.4-0.6-1.5-1.8-1.6-1-0.20.61.3

Weather Map
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wmap_P
GEOS Local Image of CentralWestCoast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Sacramento, CA
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